7-hydroxy-3-aminoalkyl-2-oxo-1,2-dihydroquinoline esters and ethers



United States Patent 07 US. Cl. 260287 8 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to derivatives of the 7-hydroxy-2-oxo-1,2-dihydroquinolines found to be particularly suitable for use as coronary artery dilators. Those derivatives found to be particularly useful for this purpose have the formula wherein R is selected from the group consisting of hydrogen,

methyl and ethyl;

R is selected from the group consisting of fl-piperidinoethyl, fi-morpholinoethyl, B-pyrrolidinoethyl, ,B-[N- methyl-piperidyl (2) ]-ethyl, B-(pyridyl-2)-ethyl, fl-(pyr idyl-4)-ethyl and dialkylaminoalkyl having the formula A is an alkyl radical that contains no more than 3 carbon atoms and B is an alkylene radical containing 2-4 carbon atoms;

R is selected from the group consisting of methyl, ethyl,

propyl and phenyl;

R is selected from the group consisting of allyl and alkoxycarbonylalkyl having the formula -DCOO-E wherein D is methylene or ethylene and E is an alkyl radical containing 2-4 carbon atoms X is hydrogen or bromine and X is hydrogen, chlorine or bromine.

3,514,459 Patented May 26, 1970 ice The present application is a continuation-in-part of our United States Ser. No. 584,665, filed Oct. 6, 1966, now abandoned, which was in turn a continuation-in-part of our United States Ser. No. 356,318, filed Mar. 31, 1964, and now abandoned.

The present invention relates to new and therapeutically valuable derivatives of the 7-hydroxy-2-oxo-L2-dihydroquiiijoline. The new derivatives of the 7-hydroxy-2-oxo- 1,2-dihydroquinoline under the present invention may be represented by the general formula wherein R is selected from the group consisting of hydrogen,

methyl and ethyl;

R is selected from the group consisting of fl-piperidinoethyl, fl-morpholinoethyl, B-pyrrolidinoethyl, fi-[N- methyl-piperidyl (2)]-ethyl, fl-(pyridyl-2)-ethyl, fl-(pyridyl-4)-ethy1 and dialkylaminoalkyl having the formula wherein A is an alkyl radical that contains no more than 3 carbon atoms and B is an alkylene radical containing 2-4 carbon atoms;

R, is selected from the group consisting of methyl, ethyl,

propyl and phenyl;

R, is selected from the group consisting of allyl and alkoxycarbonylalkyl having the formula -D-COO-E wherein D is methylene or ethylene and E is an alkyl radical containing 2-4 carbon atoms X is hydrogen or bromine and X is hydrogen, chlorine or bromine.

The new derivatives of the 7-hydroxy-2-oxo-1,2-dihydroquinoline are obtained in the known methods by allowing 7-hydroxy-2-oxo-1,2-dihydroquinolines of the general formula Xi R2 to react with alkylating agents appropriate for the introduction of the R,-radical, especially halogen compounds of the general formula R -Hal in the presence of an acidbinding agent, or by condensing aminophenols of the general formula The 7-hydroxy-2-oxo-1,2-dihydroquinolines bearing halogen atoms and serving likewise as starting materials can be prepared according to known methods by halogenation of the corresponding 7-hydroxy-2-oxo-1,2dihydroquinolines unsubstituted in 6 and 8-position. This causes the disu bstitution to occur in 6- and 8-position and the mono- NH substitution in 8-position.

mo 1 The derivatives of the 7-hydroxy-2-oxo-1,Z-dihydro- X B1 quinolines according to our present invention exhibit a 10 very good and specifically coronary vasodilator action. In this respect they are by far superior to the natural with fl-keto-acid esters of the general formula products papaverine and khelline. They, therefore, are valuable therapeutics themselves but they may also be R used as intermediates for the manufacture of therapeutical substances.

a f 011-0003111111 The comparative pharmacological tests of the substances with respect to their coronary vasodilator action were carried out in dogs according to the method disclosed by Eckenhoif, Hafkenschiel and Landmesser (Am.

For the introduction of the Rfladical there are J. Physiol. 148, 582 (1947) The test preparations were propriate besides the compounds R4 Hal, likewise other applied intracoronarily or intravenously to the animals conventional alkylating agents, for example, unsaturated narcotlzed- The coToPary g flow was l i carboxylic acids or their functional derivatives respecmeans of an automatlc ow'Meter and t e b 00d tively, lactones, lactames as well as suited sulfuric acid Pressure was measurad the femoral artery means esters and the like 2a of an Anderson-Glass-Capsule Manometer. During the The 7-hydroxy-2-oxo-1,2-dihydroquinolines required, test period the animals were g ven artificial respiration. inter alia, as initial products may be obtained accofding On these test conditions the dilatation of the coronary to known methods, by condensing correspondingly artery caused by the test substance, g ves rise to a more stituted i esters f the general f l rapid bubble flow, Whereas a constriction of the coronary vessels becomes evident from a retardation of the bubble R2 flow, which is recorded by a kymograph. In all these tests papaverine was used as a comparative standard Rg-fi-(JE-COOalkyl Substance.

0 The following tables show the results obtained of the comparative tests:

TABLE I.INTRACO RONARY ADMINISTRATION Papaverine Maximum Maximum increase in Duration increase in Duration the coronary of the the coronary of the Dosage, flow in action in Dosage, fiowin action in Substance vl gpercent minutes /kg. percent minutes 3-(-B-dlethylarulnoethyl)-4-methyl-7-ethoxycarbonylmethoxy-Z-oxo-1 2-dlhydroquino1ine-hydrochlorlde 20 62 ca. 40 10 2% 3-(-fl-piporidlnoethyl)-4-met qulnoline hydrochloride 10 21 25 10 31 4 3-(B-rnorpholinoethyD-4-me quinollne hydrochloride... 10 77 35 10 46 2 1-ethy1-3-(fl-plperidlnoethyD-4-m yl -ethoxycarbonylmethoxy-2oxo-1,2-

dihydroqulnoline hydrochloride 10 54 20 1O 52 8 3-(fi-diethylaminoethyl)-4-phenyl-7-ethoxycarbonylmethoxy-Z-oxo-l,2-dihydroquinolinc hydrochloride 5 29 15 10 50 3 3-(B-diethy1aminoethyl)-4-methyl7-allyloxy-8-chloro-2-oxo-1,2-dlhydroqulnoline hydrochloride- I .1. 50 117 20 10 111 6 3-(fi-diethylaminoethyl)-4-methyl-7-ethoxycarbonylmethoxy-S-chloroZ-oxo- 1,2-dihydroquirioline hydrochloride 10 35 30 10 28 6 3-(B-diethylaminoethylPi-rnethyl-7-eth0xycarbonylmethoxy-6,8-dibromo-2- oxo-1,2-dihydroquinol ine hydrochloride 20 68 40 10 63 5 3-(fl-morpholinoethyl)-4-methyl-7-ethoxycarbonylmethoxy-8-bromo-2-oxo-1,2-

dihydroquinollne hydrochloride 5 58 20 10 63 3 3-(6-piperidinoethyl)-4-methy1-7-ethoxycarbonylmethoxy-S-bromo-2-oxo-1,2-

dihydroquinoline hydrochloride 10 27 20 1O 28 4 3-(B-dlethylarnhi0ethyl)-4-methyl-7-ethoxycarbonyImethoxy-8-bromo-2-oxo- 1,2-dihydroquinoline hydrochloride 5 100 10 124 4 1-ethyl-3-(B plperidinoethyl)-4-methyl-7-ethoxycarbonylmethoxy-8-bromo-2- oxo-1,2-dihydroquiriol1ne hydrochloride 10 35 15 10 4.2 4 1-methyl-3-(B-diethylamlnoethyl)-4-methyl-7-cthoxycarbonyhnethoxy-S- ch1o1-o-2-oxo-1,2 dihydroquinoline hydrochloride 2.1g 12% 2? 1g 34 i? 81 Khemne with aminophenols of the general formula Comparative tests were also made under the same conditions as described hereinbefore. but with intravenous ad ministration of papaverine and the 7-hydroxy-2-oxo-1,2- dihydroquinoline derivatives according to the invention. The following table indicates the results obtained.

TABLE II.-INTRAVENOUS ADMINISTRATION Maximum Decrease in Toxicity increase in Duration the mean Dan, D the coirionary of the acblood g. g. 1.17. osage ow in on in pressure Substance mouse mgJkg. percent minutes in mm. Hg

Papaverine 0,026 o. 3-te diethylamiuoethyl)-4-methy1-7-ethoxycarbonylmethoxy-2-oxo-l,2-dihydroqulnoline 8 23 10 30 hydro-chloride 0. 2 2. 42 50 3-(fl-piperrdmpethyl)-4-methyl-7-ethoxycarbonylmethoxy-2-oxo-1,2-dlhydroquinollne hydrochloride 0. 1. 0 67 120 5 3-(B-morphohnoethyl)-4-methyl-7-ethoxycarbonylmethoxy-2oxo-l,Z-dihydroqulnoliue hydrochlorlde 0.2 2. 0 71 50 8 1-ethyl-3:(e-plperidinoethyl)-4-methyl-7-ethoxycarbonylmethoxy-2oxo-1,Z-dlhydroquinollne hydrochloride 0. 022 2.0 52 120 15 3a(B-dlethylamlnoethyl)+phenyl-7-ethoxycarbonylmethoxy-2-oxo-1,2-dlhydroquinolh1e hydrochloride 0. 0e 1. o 32 7 0 3 (g-dlethylammoethyl)-4-methy1-7-allyloxy-8-chloro-2-oxo-1,2-dihydroquinoline hydroch q 0. 029 2. 0 22 5 a (5-diethylamluoethyl)-4methyl-7-ethoxycarbonylrnethoxy-S-chloro-Mxo1.2-dihydroqulnollne hydrochloride 0. 18 2. 0 117 180 20 3-(o-diethylamlnoethyl)-4-methyl-7-ethoxycarbonylmethoxy-o,8-dibromo-2-oxo-l,2-dih droqnluolme hydrochloride r 0. 2 2. 0 22 4o 3 3-(B-mor hohnoethyl)-4-rnethyl-7-ethoxycarbonyhnethoxy-8-bromo-2-oxo-1,2-dlhydroquinol e hydrochlorlde 0. 1s 2. 0 a1 60 1o 3-(B-piperldinoethyl)+methyl-7-ethoxycarbonylmethoxy-8'bromo-2-oxo-1,2-dihydrouinoline hydrochloride 0, 044 2, 0 37 7 5 3-(B-diethylaminoethyl)-4-methyl-7-ethoxycarbouylmethoxy-8-bromo-2-oxo-l,2-dihydroquinoline hydrochloride o. 075 0. 5 90 90 u 1-ethyl-3-to piperldmoethyl) i-methyl-7-ethoxycarbonyhnethoxy-8-bromo-2-oxo-l,2-d1- dro uinoline hydrochloride. r 0. 04 o. 5 1o 60 1o 1-methyl-3-(B-drethylamlnoethyl)-4-methyl-7-ethoxycarbonylmethoxy-S-chloro-Z-oxo- 1,2-dihydroquinoline hydrochloride o. 032 2, o 69 0 15 3-(p-plperidinoethyl)-4-ethyl-7-ctnoxycarbonylmethoxy-2-oxo-1,Q-dlhydroquinoline hydrochloride 0. 07 1. 0 78 80 17 3-[B-(pyrldylt)-ethyl1-4-rnethyl-7-ethoxycarbonylmethoxy-2-oxo-1,2-dihydroqumoline hydrochlorid 0. 03 2. 0 69 55 +3 3-Da-(pyridyl-2)-ethyl]-4-methyl-7-ethoxycarbonylmethoxy-Mxo-l,2-dlhydroqumolme hydrochloride--- o. 046 2.0 55 15 -11 3-[5-(N-methylpiperidyl-2)-ethyl14-methyl-7-ethoxycarbonylmethoxy-2oxo-1,2-dlhydroqulnoline hydrochlorid 0. 12 2. 0 54 60 +6 l-methyl-B-(fi-piperrdinoethyl)4-methyl-7-ethoxycarbonylmethoxy-h quinoline hydro chloride 0. 032 1. 0 69 60 5 3-('y-diethylamlnopropyl)-4-methyl-7-ethoxycarbonylmethoxyoquinoline hydrochlor de c- 0. 135 2. 0 2o -4 3(B-diethylaminopropyl)-4-methyl-7-ethoxycarbonylmetho line hydrochloride 0. 0975 2. 0 28 15 3-(3-diethylamlnoethyl)-4-methyl-7-[a-(ethoxycarbonyD-eth uinoline hydrochloride 0. 08 2. o 15 30 -5 3-(p-diethylamiuoethyl)-4propyl-7-ethoxycarbonylmethoxy droquinollne hydrochloride 0. 11 2. 0 88 10 3-(fl'diethylaminoethyl)-4-methyl-7-lsopropoxycarbonylmethox dihydrouinoline hydrochloride 0. 095 2. 0 46 +3 3-(adiethylamlnoethyl)-4-mcthyl-7-1sobutoxycarbonylmethoxy-2-ox 2-dihydroquinoline hydrochloride 0. 14 2. 0 35 60 +7 3F(fl diethylaminoethyl)-4-methyl-7-[a-(ethoxycarb 0-?r0XO-L2-dlr h droqulnoline hydrochloride 0. 26 2. 0 61 60 +5 3-(B-piperidinoethyl)+ethyl-7-ethoxycarbon xo-l,2-dihydroqulnoline hydrochloride 0. 018 2. 0 8o -21 1-methy1-3-(B-piperidlnoethyl)-4-methy1-7- lmethoxy-S-bromo-2oxo-1,2-dlhydroquinolino hydro chloride 0. 018 2. 0 83 -3 3-('y-dimethylamino-isobutyl)-4-methyl-7- lmethoxy-8-bromo-2'oxoL2-dihydro qulnollne hydrochloride 0. 028 2. 0 107 60 +1 3-(fl-isopropylamlnoethyl)-4-1nethy1-7-et thoxy-8-bromo-2-oxo-1,2-dihydro quinoline hydrochloride 0. 038 2. 0 83 90 -20 3-(fl-pyrrolldlnocthyl)-4-methyl-7-ethoxy ethoxy-8-bromo-2-oxo-L2-dihydroquinollne hydrochloride... 0. 06 2. 0 69 6o -2 3-(B-diethylaminopropyD-4-m ethoxycarbonylrnethoxy-8-bromo-2'oxo-L2-dihydrouinoliue hydrochloride 2. o 76 60 -11 8-(B-dimethylaminoethyl)+methyl-7-ethoxycarbonylmethoxy-8-brom0-2'oxo4,2-dihydroqulnoline hydrochloride 0. l1 2. 0 82 20 -30 3-( -diethylaminopropyl)-4-methyl-7-ethoxycarbonyhnethoxy-8-bromo-2-oxo-1,2-dlhydroqulnoline hydrochloride 0. 05 2. 0 69 16 l-methyl-3-(B-piperidlnocthyl)-4-ethyl-7-ethoxycarbonylmethoxy-8bromo-2-0xo-l,2-dihydroquinoline hydrochloride 0. 048 2.0 74 so -2 3-(fi-piperidinoethyl)-4-propyl-7-ethoxycarbonyhnethoxy-8-bromo-2-oxo-l,2'dihydroquinoline hydr ch 0. 01 2. 0 138 70 -11 1. 0 8 7 20 Khelline 0.02 2'0 11 7 EXAMPLE 1 In the preparation of dragees and tablets containing as essential active ingredient the 7-hydroxy-2-oxo-L2-dihydroquinoline derivatives of our invention these substances may be admixed with the conventional solid tabletting adjuvants, such as starch, lactose, talc and the like. Any of the tablesetting materials and carriers customary in pharmaceutical practice may be employed.

For the preparation of the injection solutions the salts of the basically substituted compounds are particularly suited since they have mostly a good Water-solubility. Injection solutions of water-insoluble products may of course be prepared in the conventional manner by concurrently using well-known suspending agents, emulsifiers and/ or solubilizers.

The following examples are given for the purpose of characterizing the substances of the present invention. All temperatures given are in degrees centigrade.

27.4 grams 3-(B-diethylaminoethyD-4 methyl-7-hydroxy-2-oXo-1,2 dihydroquinoline (colourless crystals having a melting point of 248 with decomposition) are stirred for 2 hours at 70 together with 16 grams anhydrous potassium carbonate in 260 com. dimethylformamide. Then 14 grams chloroacetic acid ethyl ester are allowed to drop in and stired for another 9 hours at 70. The reaction mixture is filtered off with suction from the inorganic salts and the filtrate concentrated in vacuum to dryness. The residue is dissolved in ethyl acetate and the solution is washed several times with a diluted sodium hydroxide solution. The ethyl acetate layer is then separated and dried. While introducing hydrochloric acid gas the hydrochloride of the reaction product precipitates in the form of colourless needles having a melting point of substituted in 7-position are obtain-ed, which are described in the following table.

Initial product 3-(fi-piperidinoethyl)-4-methyl-7- hydroxy-2-oxo-1,Z-dihydroquinoline.

Ghloroacetic acid ethyl ester 3-(B-piperidinoethyl)4-methyl-7- Final product Melting point, degrees 266 (hydrochloride). ethoxycarbonylmethoxy-zoxo- 1,2-dihydroquinoline.

3-(B-diethylarm'noethyl) +n-propyl-7- do 3-(fl-diethylaminoethyl) -4-n- 235 (hydrochloride).

hydroxy-2-oxo-1,2-dihydro quinoline. propyl-7-ethoxycarbonylmethoxy-2-oxo-1,2-dihydroquinoline. 3- (B-piperidino ethyl) -4-ethyl-7- do 3-( 3-pip en'dinoethyl) -4-ethyl-7- 251 (hydrochloride).

hydroxy-2-oxo-1,Z-dihydroquinoline.

1-ethyl-3-(flpiperidinoethyl)-4-ethy1-7- hydroxy-S-bromo-2-oxo-1,2- dihydroquinoline.

do 3- (B-piperidinoethyl) -4-ethyl-7- do 1-ethyl-3-(ti-piperidinoethyl)4- ethoxycarbonylmethoxy-2-oxo- 1,2-dihydroquinoline.

207 (hydrochloride) ethoxycarbonylmethoxy-B- bromo-2-oxo-l,2-dihydroquinoline.

232 (hydrochloride). ethyl-7ethoxycarbonylmethoxy-8-bromo'2-oxo-1,2-

dihydroquinoline. 1-methyl-3-(fl-piperidinoethyl)-4-ethyl-7- .d 1-methyl-3-(Bpiperidinoethyl)4- 232 (hydrochloride).

hydroxy-8-bromo-2-oxo-1,2- ethyl-7-ethoxycarbonyldihydroquinoline. methoxy-8-bromo-2oxo-1,2-

dihydroqujnoline. a-(fi-piperidinoethyl)4-n-propyl-7- .do 3-(B-piperidinoethyD-4-n-propy1- 209 (hydrochloride).

hydroxy-8-bromo-2-oxo-l,2- dihydroquinollne.

quinoline. 3-(B-dirnethylaminoethyl) -4-methyl-7- do 3- (B-dimethylaminoethyl) -4- 255 (hydrochloride).

hydroxy-Z-oxo-l,2-dihydroquinoline. methyl-7-ethoxycarbonylmethoxy-loxo-lfl-dihydroquinoline. 3-( -dimethylarnino-B-rnethyl-propyl)- d0 3-('y-dimethylamino-fl-methyl- 198 (hydrochloride).

4-methyl-7-hydroxy-2-oxo-1,2- dihydroquinoline.

3-(fl-dlisopropylaminoethyl)-4-methyl-7- hydroxy-Z-oxo-l,2-dihydroquinoline.

3-(fi-pyrrolidinoethyl)4-methyl 7- hydroxy-2-oxo-1,2-dihydroquinoline.

3-[18-(pyridyl-4)-ethyl]-4-methyl-7- hydroxy-Z-oxo-l,2-dihydroquinoline.

..d0 3-(fi diisopropylaminoethyl)-4- -..-d0 B-(B-pyrrolidinoethyl)-4-rnethyldo 3-[6- (pyridyl2) -ethyl]-4-methyldo 3-[6-(pyridyl-4)-ethyl]-4-methyl7- propyl)-4-methyl-7-ethoxycarbonylmcthoxy-Q-oxo-l,2-

dihydroquinoline.

130 decomposition (hydrochloride). methyl-7ethoxycarbonylmethyl-2-ox-1,2-dihydroquinoline.

258 (hydrochloride). 7-ethoxycarhonylmethoxy-Z- oxo-l,2-dihydroquinoline.

215 (hydrochloride). 7-ethoxycarbonylmethoxy2- oxo-l,2-dihydroquinoline.

244 (hydrochloride). ethoxycarbonylrnethoxy-Z-oxo- 1,2-dihydroquinoline.

3-[fl-(1-methylpiperidyl(2)-)ethylli- ..d0 3-[6-(l-methylpiperidyl(2)-)- 186 (base).

methyl-7-hydroxy-2-oxo-1,2-dihydroethyl]-4-methyl-7-ethoxyquinoline. carbonylmethoxy-2-oxo-l,2-

dihydroquinoline. 3-(y-diethylaminopropyl)-4-methyl-7- do 3-(y-diethylaminopropyl)-4- 110 decomposition (hydrochloride),

hydroxy-2-oxo-1,2-dihydroquinoline.

1-methyl-3-(fl-piperidinoethyD-4- methyl-7-hydroxy-2-oxo-l,2- dihydroquinoline.

3-(fi-diethylaminoethyl)-4-methy1-7- hydroxy-Z-oxo-l,2-dihydroquinoline.

3-(B-diethylarninoethyl)-4-methyl-7- hydroxy-2oxo-1,Z-dihydroquinoline.

do 3-(B-1norpholinoethyl) -4-methyl- Chloroacetic acid isobutylester 3-(B-diethylaminoethyl)-4- methyl-7-ethoxycarbonylmethoxy2-ox0-1,2-dihydroquinoline.

248 (hydrochloride). 7-ethoxycarbonylrnethoxy-2- oxo-l2dihydroquinoline.

182 (hydrochloride). methyl-7-ethoxycarbonylquinoline.

237 (hydrochloride). methyl-7-isopropoxycarbonylmethoxy-2-oxo-1,2-dihydroquinoline.

221 (hydrochloride). methyl-7-isobutoxycarbonylmethoxy-2-oxo-1,2-dihydroquinoline.

oline used as starting material by the S-(B-diethylaminopropyl) 4-methyl-7-hydroxy-2-oxo-1,2-dihydroquinoline and working for the rest as described, the 3-( S-diethylaminopropyl) 4-methyl-7-ethoxy-carbonylemethoxy-Z-oxo- 1,2-dihydroquinoline is obtained, its hydrochloride having a melting point of 221-222 EXAMPLE 2 I-Z-dihydroquinoline derivatives in the manner as indicated in Example 1 the corresponding derivatives being EXAMPLE 4 31 grams 1-ethyl-3-(,B-piperidinoethyl)-4-methyl-7-hydroxy-2-oxo-1,2-dihydroquinoline are suspended in 280 com. toluene. 5.4 grams sodium methylate are then added and the mixture is stirred for 2 hours at 70. 15 grams chloroacetic acid ethyl ester are subsequently allowed to drop in and it is stirred for another 8 hours at 70. The reaction mixture is filtered oil with suction from the precipitated inorganic salts and the filtrate is concentrated in vacuum to dryness. The residue is dissolved in methylene chloride and the solution is Washed several times with a diluted sodium hydroxide solution. By introduction of hydrochloric acid gas into the dried methylene chloride solution the hydrochloride of the 1-ethyl-3-(fi-piperidinoethyl) 4 methyl-7-ethoxycarbonylmethoxy-Z-oxo-1,2-dihydroquinoline having a melting point of is precipitated. Yield: 16 grams.

EXAMPLE 5 18.5 grams 3-(fl-diethylaminoethyl) 4 phenyl-7-hydroxy-Z-oxo-1,2-dihydroquinoline and 9.5 grams anhydrous potassium carbonate are suspended in 200 com. di-

ethylformamide and are stirred for 2 hours at 7 9 grams chloroacetic acid ethyl ester are then allowed to drop in and it is stirred for another 8 hours at 70. The reaction mixture is now filtered off with suction, while hot, and the filtrate is concentrated in vacuum to dryness. The residue is dissolved in ethyl acetate and this solution is washed several times with diluted sodium hydroxide solution. By introduction of etherous hydrochloric acid into the dried ethyl acetate solution the hydrochloride of the S-(B-diethylaminoethyl) 4 phenyl-7-ethoxycarbonylmethoxy- 2-oxo-l,2-dihydroquinoline is precipitated. For further purification the raw product is recrystallized from a mixture of alcohol and methyl ethyl ketone (1:2). Melting point of the hydrochloride: 229. Yield: 8.5 grams.

EXAMPLE 6 27.4 grams 3-(6 diethylaminoethyl)-4-methyl-7-hydroxy-2-oxo-1,2-dihydroquinoline are suspended in 250 ccm. dimethylformamide and are stirred after the addition of 16 grams anhydrous potassium carbonate for 2-hours at 70. 21 grams a-bromopropionic acid ethyl ester are then allowed to slowly drop in. The reaction mixture is stirred for another 8 hours at 70 and it is filtered off with suction, while hot. The isolation of the hydrochloride of the reaction product can be made as described in Example 5. Thus, 12.5 grams of the 3-(fi-dimethylaminoethyl)-4- methyl 7 (a-ethoxycarbonylethoxy)-2-oxo-l,2-dihydroquinoline hydrochloride having a melting point of 184' are obtained.

EXAMPLE 7 (a) 34.5 grams of 3-(13-diethylaminoethyl)-4-rnethyl- 7-hydroxy-8-chloro-2-oxo-1,2-dihydroquinoline hydrochloride and 28 grams anhydrous potassium carbonate are suspended in 300 ccm. dimethylformamide and stirred for about 2 hours at 70-80". 16 grams chloroacetic acid ethyl ester are then allowed to drop in and it is stirred for another 6 hours at 7080. While hot, the reaction mixture is filtered off with suction from the potassium chloride and concentrated in vacuum to dryness. The residue is digested with ethyl acetate whereby the raw base which remains is filtered 01f with suction and dried. It is then dissolved in dimethylformamide and the solution is filtered. By introduction of hydrochloric acid gas into the filtered solution, the hydrochloride of the S-(fi-diethylaminoethyl) 4 methyl 7 ethoxycarbonylmethoxy 8- chloro-2-oxo-1,Z-dihydroquinoline having a melting point of 220-222 is precipiated. Yield: 20 grams.

When using in the above example instead of 16 grams chloroacetic acid ethyl ester 14 grams allylbromide, the 3-(B-diethylaminoethyl)-4-methyl 7 allyloxy-8-chloro- 2-oxo-1,2-dihydroquinoline hydrochloride is obtained in the form of colourless crystals having a melting point of 189 (after recrystallization from methanolzwater=1: l).

(b) The 3-(5 diethylaminoethyl)-4-methyl-7-hydroxy- 8-chloro-2-oxo-1,2-dihydroquinoline hydrochloride used as starting material can be obtained in the following man ner:

A soft current of chlorine gas is introduced at 1020 into a solution of 27.4 grams 3-(fi-diethylaminoethyl)- 4-methyl-7-hydroxy-2-oxo-1,2-dihydroquinoline (having a melting point of 248 with decomposition) in 274 ccm. glacial acetic acid. After about 1 hour the reaction mixture solidifies to a colourless crystal paste. It is filtered oif with suction and the residue is washed with some glacial acetic acid and ether and then dried. The reaction product crystallized from methanol in the form of colourless needles having a melting point of 300 with decomposition.

Analysis.Calcd for C H O N CLHCl (percent): Cl==20.6; N=8.l. Found percent: Cl=19.35; N=7.85.

EXAMPLE 8 (a) 43.4 grams 3-(fi-diethylaminoethyl)-4-methyl-7- hydroxy-S-bromo 2 oxo-l,2-dihydroquinoline hydrobromide are suspended in 300 ccm. dimethylformamide and, after the addition of 30 grams anhydrous potassium carbonate, are subsequently stirred for 2 hours at -80". Then 16 grams chloroacetic acid ethyl ester are allowed to drop in and the reaction mixture is stirred for another 10 hours at 70-80. The reaction product is filtered off with suction, while hot, and the filtrate is concentrated in vacuum to dryness. The residue is recrystallized from methanol whereby the 3-(B-diethylaminoethyl)-4-methyl- 7-ethoxycarbonylmethoxy-8-bromo 2 oxo-l,2-dihydroquinoline is obtained in colourless crystals having a melting point of 143-145.

Analysis. Calcd for C H 1O N Br (percent): C=54.65; H=6.15; Br=18.23. Found (percent): C=54.38; H=6'.3; Br=l8.06.

(b) The 3-(fl-diethylaminoethyl)-4-methyl-7 hydroxy- -8-bromo-2-oxo-1,2-dihydroquinoline hydrobromide used as starting material can be obtained as follows: 27.4 grams 3 (fl-diethylaminoethyl) 4 methyl 7 hydroxy-2-oxo-1,2-dihydroquinoline are dissolved at room temperature in '274 com. glacial acetic acid. Then 17 grams gromine dissolved in ccm. glacial acetic acid Melting point of the hydrochloride, Initial product Flnal product degrees 3-(B-diethylaminoethyI)-4-methyl-7-hydroxy-8- Allylbromide 3-(B-dlethylaminoethyl)-4-methyl-7-allyloxy8- 200 bromo-Z-oxo-l,2-dihydroquinoliue hydrobromlde. br0mo-2-oxo-1,Z-dihydroquinoline. 1-rnethyl-3-(B-diethylaminoethyl)-4-methyl-7- Chloroacetic acid ester 1-methyl-3-(fi-diethylaminoethyl)-4-methyl-7- 196 hydroxy-S-bromo-2-oxo-1,2-dihydroquiuollne. gtogcarbionlmethoxy-S-bromo-Z-oxd1,2-

y oqu no me. 3-(B-diethylaminoethyl)-4-methyl-7-hydrozgy-8- 'y-bromopropionicacid ethylester 3-(fl-dlethylamlnoethyl)-4-methyl-7-(a-ethoxy- -111 bromo-2-oxo-L2dihydroquinoline. carbonylethoxy)-8-bromo-2-oxo-1,2-

dihydroquinoline. 1-methyl-3-(B-piperidinoethyl)-4-methyl-7- chloroacetic acid ethyl ester 1-methyl-3-(B-piperidinoethyl)-4-1nethyl-7- 212 hydroxy-8-bromo-2 oxo-l,2-dihydroquinoline. ethoxycarbonylmethoxy-8-bromo-2-oxo-l,2-

dihydroquinoline. 3-(-y-dimethy1aminoisobutyl)-4-methyl-7-hydroxy- ..do 3-(v-dimethylaminoisobutyl)-4-methyl-7- 193 8-bromo-2-oxo-1,2-dihydroquinoline. ethoxycarbonylmethoxy-S-bromo-Z-oxo-l,2-

dihydroquinoline. 3-(B isopropylaminoethyl)-4-methyl-7-hydroxy-& ....do 3-(B-isopropylaminoethyl)-4-methyl-7- hromo-2-oxo-1,2-dihydroquinoline. ethoxycarbonylmethoxy-8-bromo-2oxo-1,2-

dihydroquinoline. 3-(B-pyrrolidinoethyl)-4-methyl-7-hydroxy-8- do 3-(Bpyrrolidinoethyl)-4-methyl-7-ethoxy- 228 br0mo-2-0xo-1,2-dihydroquinoline. carbonylmethoxy-8-bromo-2-oxo-1,2-

dihydroquinollne. 3-(B-dlethylaminopropyl)+methyl-7-hydroxy-8- do 3-(B-diethylaminopropyl)-4-methyl-7ethoxy- 1 65 bromo-2-oxo-1,2-dihydroquinoline. carbonylmethoxy-S-bromo-2-oxo-1,2-

. dihydroquinoline. 3-(B-dimethylaminoethyl)-4-methyl-7-hydroxy-8- do 3-(B-dirnethylaminoethyl)-4-methyl-7-ethoxy- 220 bromo-2-oxo-1,2-dihydroquinoline. carbonylmethoxy-8-bromo-2-oxo-1,2-

dihydroquinoline. 3-(y-diethylamiuopropyl)-4-methyl-7-hydroxy-8- do 3-( -diethylaminopropyl)-4-methyl-7-ethoxy- 191 bromo-2-oxo-1,2-dihydroquinollne.

1 With decomposition.

carhonylmethoxy-S-bromo-Z-oxo-l,2- dihydroqulnoline.

are allowed to drop in at a temperature of 20-30. The reaction mixture is stirred for another hour at 60-70 whereby the hydrobromide, even while hot, precipitates in the form of nearly colourless crystals. After cooling, the reaction product is filtered off with suction and dried. The bromination product obtained possesses a melting point of 263265 with decomposition.

Analysis.Calcd for C H 'O N BnHBr. (percent): Br=36.87. Found (percent): Br=36.53.

According to the prescription given under (a) the derivatives substituted in 7-position as described in the table hereinafter may be obtained by reacting the following 7-hydroxy-2-oxo-1,2-dihydroquinoline derivatives as indicated.

EXAMPLE 9 (a) 51.3 grams 3-(p-diethylaminoethyl)-4-methyl-6,8- dibromo-7-hydroxy-2-oxo-1,2-dihydroquinoline hydrobromide and 28 grams anhydrous potassium carbonate are suspended in 300 com. dimethylformamide and the mixture is stirred for 2-3 hours while heated up to 7080-. 16 grams chloroacetic acid ethyl ester are then allowed to slowly drop into the reaction mixture which is stirred for another 10 hours at 7 -80". Then the inorganic salts are filtered off with suction, while hot, and the dimethylformamide filtrate is concentrated in vacuum almost to dryness. When digesting the partially crystallized residue with ethyl acetate the 3-(j3-diethylaminoethyl)-4-methyl- 6,8 dibromo 7 ethoxycarbonylmethoxy 2 oxo 1,2- dihydroquinoline remains in the form of a pale yellowish substance having, after repeated recrystallization from ethyl acetate, a melting point of 177-178. Its hydrochloride forms colourless crystals having a melting point of 202-203.

(b) The starting material can be obtained as follows: 24.4 grams 3-(B-diethylaminoethyl)-4-methyl-7-hydroxy- 2-oxo-1,2-dihydroquinoline are dissolved at room temperature in 900 ccm. glacial acetic acid. Then 40 grams bromine dissolved in 100 ccm. glacial acetic acid are allowed to drop into the reaction mixture at 20-30 while vigorously stirring, stirring is continued for another 1-2 hours at 20-30 and a further 2 hours at boiling temperature. After cooling the reaction product which partially solidifies, even while warm, is filtered ofi with suction, washed with glacial acetic acid and acetone and dried. Thus, the 3-(fi-diethylaminoethyl)-4-methyl-6,8-dibromo- 7-hydroxy 2 oxo-1,2dihydroquinoline hydrobromide is obtained in a yield of 96%. After recrystallization from dimethylformamide it forms colourless crystals of a melting point of 255-257" with decomposition.

EXAMPLE (a) 10.5 grams 1-methyl-3- (p-diethylaminoethyD-4- methyl 7 hydroxy 8 chloro 2 oxo 1,2 dihydroquinoline hydrochloride and 10 grams anhydrous potassium carbonate are suspended in 100 ccm. dimethylformamide and stirred at 70 for 2 hours. Then 4.5 grams of chloroacetic acid ethyl ester are allowed to drop in and it is stirred for another 7 hours at 70. The reaction mixture is filtered off with suction and the filtrate concentrated in vacuum to dryness. The raw product is dissolved in ethyl acetate and washed several times with diluted sodium hydroxide solution. By introduction of hydrochloric acid gas into the dried ethyl acetate solution, the reaction product precipitates in the form of its hydrochloride having a melting point of 135. Yield: 6.2 grams.

*(b) The 1-methyl-3-(B-diethylaminoethyl)-7-hydroxy- 8-chloro-2-oxo-1,2-dihydroquinoline hydrochloride can be produced in the following manner: grams sulphurylchloride are softly added at room temperature to 31.5 grams 1 methyl 3 3 diethylaminoethyl)-4-methyl-7- hydroxy-Z-oxo-1,2-dihydroquinoline hydrochloride having a melting point of 8--obtainable according to known methods by condensation of fi-diethylaminoethyl-acetoacetic acid ester with N-methyl-m-aminophenolbeing suspended in 500 ccm. glacial acetic acid. The reaction mixture is stirred for about 3 hours at 40-50. Then the glacial acetic acid is distilled off under reduced pressure, the semisolid residue digested, while cold, with about 300 ccm. acetone, the remaining chlorination product filtered off with suction and the residue recrystallized from dimethylformamide. The reaction product forms colourless crystals having a melting point of 266-268 (with decomposition) EXAMPLE 11 22 grams 3-(fi-piperidinoethyl)-4-methyl-7-hydroxy-8- bromo-2-oxo-1,2-dihydroquinoline hydrobromide and 15 grams anhydrous potassium carbonate are stirred in ccm. dimethylformamide for 2 hours at 70. 8 grams chloroacetic acid ethyl ester are allowed to drop in during a period of 4 hours and the mixture is then stirred for another 5 hours at 70. The reaction mixture is filtered off with suction, while hot, and the filtrate is concentrated in vacuum to dryness. The resulting residue is dissolved in methylene chloride and the solution is washed several times with diluted sodium hydroxide solution for removal of the unreacted starting material. By introduction of hydrochloric acid gas into the dried methylene chloride solution the hydrochloride of the 3-(fi-piperidinoethyl)-4-methyl 7 ethoxycarbonyhnethoxy-S-bromo-Z-oxo-1,2-dihydroquinoline having a melting point of 204 precipitates. Yield: 14 grams.

When using in the the above example as a starting material instead of the 3-(B-piperidinoethyl)-4-methyl-7-hydroxy-8-bromo-2-oxo-1,Z-dihydroquinoline hydrobromide an equivalent quantity of the 3-(B-morpholinoethyl)-4- methyl-7-hydroxy-8-bromo-2-oxo 1,2 dihydroquinoline hydrobromide, the 3-(fl-morpholinoethyl) 4 methyl-7- ethoxycarbonylmethoxy 8 bromo-2 oxo 1,2-dihydroquinoline is obtained in a good yield, its hydrochloride having a melting point of 231.

EXAMPLE 12 24 grams 1-ethyl-3-(B-piperidinoethyl)-4-methyl-7-hydroxy-8-bromo-2-oxo-1,2-dihydroquinoline hydrobromide and 15 grams anhydrous potassium carbonate are suspended in 200 ccm. methyl ethyl ketone. This mixture is stirred for 2 hours at 70 and then 8 grams chloroacetic acid ethyl ester are allowed to slowly drop in at this tempenatlure. To complete the reaction stirring is continued for another 8 hours at 70. The reaction mixture is filtered olf with suction, while hot, and the filtrate is concentrated in vacuum to dryness. The resulting residue is dissolved in methylene chloride and the solution is \washed several times with diluted sodium hydroxide solution. By introducing hydrochloric acid gas into the methylene chloride solution the hydrochloride of the 1- ethyl-3-( 3-piperidinoethyl) 4 methyl-7-ethoxycarbonylmethoxy-8-bromo-2-oxo-1,2-dihydroquinoline having a melting point at 206 precipitates. Yield: 10 grams.

When reacting in an analogous manner equivalent quantities of the l-ethyl-3-(fi-diethylaminoethyl)-4-rnethyl-7-hydroxy-8-bromo-2-oxo-1,Z-dihydroquinoline hydrobromide with chloroacetic acid ethyl ester, the 1-ethyl-3- (fl-diethylaminoethyD- 4 -methyl-7-ethoxycarbonylmethoxy-8-bromo-2-oxo-1,2-dihydroquinoline is obtained, its hydrochloride having a melting point of 172.

What is claimed is:

1. A compound of the formula R is selected from the group consisting of hydrogen,

methyl and ethyl;

wherein 13 R is selected from the group consisting of 3-piperidinoethyl, B morpholinoethyl, )3 pyrolidinyl, B- N methy1piperidyl(2) ethyl, (pyridyl-2)-ethyl, fi-(pyn'dyl-4)-ethyl and dialkylaminoalkyl having the formula wherein A is an alkyl group having no more than 3 carbon atoms and B is an alkylene group having 2-4 carbon atoms;

R is selected from the group consisting of methyl, ethyl,

propyl and phenyl;

R is selected from the group consisting of allyl and alkoxycarbonylalkyl having the formula wherein D is methylene or ethylene and E is an alkyl group having 2-4 carbon atoms X is hydrogen or bromine and X is hydrogen, chlorine or bromine.

2. A compound as claimed in claim 1 wherein R is selected from the group consisting of hydrogen and methyl,

R is selected from the group consisting of diethylaminoethyl,

fl-piperidinoethyl, morpholinoethyl and B-diethylamino- P py R is selected from the group consisting of methyl and phenyl,

R is ethoxycarbonylmethoxy, X is hydrogen and X is hydrogen, chlorine or bromine.

3. The hydrochlorides of the compounds claimed in claim 1.

4. 3 (B-diethylaminoethyl)-4-methy1-7-ethoxy-carbonylrnethoxy-8-chloro-2-oxo 1,2 dihydroquinoline and its hydrochloride.

5. 3-(3 diethylaminoethyl) -4-|methyl-7ethoxycarbonylmethoxy-B-bromo-Z-oxo-1,2-dihydroquinoline and its hydrochloride.

6. S-(fl-pi-peridinoethyl) 4 ethyl-7-ethoxy-carbonylmethoxy -8-bromo-2-oxo-1,2-dihydroquinoline and its hydrochloride.

. 7. 3-('y-dimethylaminoisobutyl) 4 methyl-7-ethoxycarbonylmethoxy-8-bromo 2 oxo-1,2-dihydroquinoline and its hydrochloride.

8. 3-(fl-piperidinoethyl) 4 propyl-7-ethoxycarbonyl methoxy-S-bromo-Z-oxo-1,2-dihydroquinoline and its hydrochloride.

References Cited UNITED STATES PATENTS 2,754,293 7/1956 Brody et al. 260288 X 3,202,661 8/ 1965 Brust et al. 260288 3,210,358 10/1965 Pfister et al. 260288 3,419,563 12/ 1968 Knupfer et a1 260288 DONALD G. DAUS, Primary Examiner US. Cl. X.R. 

